Process of forging.



A. F. ROCKWELL.

PROCESS OF FORGING.

APPLIGATION FILED FEB. 16, 1911.

1,082,910. Patented Dec. so, 1913.

- WITNESSES:

INVENTOR:

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74 1; ATTORNEY,

"UNITED STATES PATENT OFFICE.

ALBERT F. ROCKWELL, OF'IBRISTOL, CONNECTICUT, ASSIGNOR TO THE NEW DEPAR- TUBE MANUFACTURING COMPANY, OF BRISTOL, CONNECTICUT, A CORPORATION OF CONNECTICUT.

PROCESS OF FORGING.

Specification of Letters Patent.

Application filed February 16, 1911.

Patented Dec. 30, 1913.

Serial No. 608,909.

. has been experienced in causing the cold metal blank to flow freely under pressure and to fill all corners of the die. Also, 1t not infrequently happens that the pressure exerted in the ,forging operation causes the blank to split and splinter along its edges.

My object is to provide a process by means of which the metal of the blank flows freely under theforging pressure, splitting of the blank under such pressure being avoided.

To these ends, and also to improve generally upon processes of the character indicated, my invention consists in the various matters hereinafter described and claimed. In the accompanying drawings, Figure 1 is an elevation, partly in section, showing a blank in position in the die ready for the action of the plunger or force; Fig. 2 is-a view of generally similar-character illustrating the parts during the pressing action; Fig. 3 is a view of generally similar character illustrating the parts at the completion of the pressing action; and Fig. 4. isa perspective view of a finished" article produced by my present process In practising myprocess I employ a blank 1 whose contour is curved, a spherical blank being preferable, and I use a force 2 and die 3 to press this blank into the desired shape of the article to be produced. I have found that when pressure is exerted upon such blank of curved contour the metal readily flows, as approximately shown in Fig. 2, and completely fills all portions of .the die without splitting.

The particular article here illustrated is a cone member for a ball bearing, the portion immediately under the force 2, as shown in Fig. 3, being in practice punched out by a subsequent operation.

Not only does this feature of employing -a blank of curved contour enable the metal to flow readily and without splitting, but it also enables the blanks to be inexpensively made and handled. The blanks are readily produced of the exact size, spheres containing exactly the required amount of metal beingconveniently punched up from wire without scrap, and these spherical blanks are quickly and easily supplied to the die even by automatic action, it being unnecessaryto consider top, bottom or any other particular face of the blank.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is- I 1. The process of forging which consists in imparting pressure to a spherical blank to force it into a die cavity having a plurality of faces, for thepurpose described.

2. The process of-forging which consists in imparting pressure to a spherical blank toforce it into a die having corners in its die cavity, for the purpose described.

In testimony whereof, I hereunto alfix my signature, in the presence of two witnesses.

ALBERT F. ROCKWELL.

Witnesses CHARLES S. JOY, LEROY W. Greene. 

